forked from mirrors/linux
c0d6bd3cd2
Assign value to clock to fix the warning below: "Using uninitialized value res. Field res.clock is uninitialized" Signed-off-by: Ma Jun <Jun.Ma2@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
106 lines
3.8 KiB
C
106 lines
3.8 KiB
C
/*
|
|
* Copyright 2008 Advanced Micro Devices, Inc.
|
|
* Copyright 2008 Red Hat Inc.
|
|
* Copyright 2009 Christian König.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
|
|
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
|
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
* OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* Authors: Christian König
|
|
*/
|
|
#include <linux/hdmi.h>
|
|
#include <linux/gcd.h>
|
|
|
|
#include <drm/amdgpu_drm.h>
|
|
#include "amdgpu.h"
|
|
|
|
static const struct amdgpu_afmt_acr amdgpu_afmt_predefined_acr[] = {
|
|
/* 32kHz 44.1kHz 48kHz */
|
|
/* Clock N CTS N CTS N CTS */
|
|
{ 25175, 4096, 25175, 28224, 125875, 6144, 25175 }, /* 25,20/1.001 MHz */
|
|
{ 25200, 4096, 25200, 6272, 28000, 6144, 25200 }, /* 25.20 MHz */
|
|
{ 27000, 4096, 27000, 6272, 30000, 6144, 27000 }, /* 27.00 MHz */
|
|
{ 27027, 4096, 27027, 6272, 30030, 6144, 27027 }, /* 27.00*1.001 MHz */
|
|
{ 54000, 4096, 54000, 6272, 60000, 6144, 54000 }, /* 54.00 MHz */
|
|
{ 54054, 4096, 54054, 6272, 60060, 6144, 54054 }, /* 54.00*1.001 MHz */
|
|
{ 74176, 4096, 74176, 5733, 75335, 6144, 74176 }, /* 74.25/1.001 MHz */
|
|
{ 74250, 4096, 74250, 6272, 82500, 6144, 74250 }, /* 74.25 MHz */
|
|
{ 148352, 4096, 148352, 5733, 150670, 6144, 148352 }, /* 148.50/1.001 MHz */
|
|
{ 148500, 4096, 148500, 6272, 165000, 6144, 148500 }, /* 148.50 MHz */
|
|
};
|
|
|
|
|
|
/*
|
|
* calculate CTS and N values if they are not found in the table
|
|
*/
|
|
static void amdgpu_afmt_calc_cts(uint32_t clock, int *CTS, int *N, int freq)
|
|
{
|
|
int n, cts;
|
|
unsigned long div, mul;
|
|
|
|
/* Safe, but overly large values */
|
|
n = 128 * freq;
|
|
cts = clock * 1000;
|
|
|
|
/* Smallest valid fraction */
|
|
div = gcd(n, cts);
|
|
|
|
n /= div;
|
|
cts /= div;
|
|
|
|
/*
|
|
* The optimal N is 128*freq/1000. Calculate the closest larger
|
|
* value that doesn't truncate any bits.
|
|
*/
|
|
mul = ((128*freq/1000) + (n-1))/n;
|
|
|
|
n *= mul;
|
|
cts *= mul;
|
|
|
|
/* Check that we are in spec (not always possible) */
|
|
if (n < (128*freq/1500))
|
|
pr_warn("Calculated ACR N value is too small. You may experience audio problems.\n");
|
|
if (n > (128*freq/300))
|
|
pr_warn("Calculated ACR N value is too large. You may experience audio problems.\n");
|
|
|
|
*N = n;
|
|
*CTS = cts;
|
|
|
|
DRM_DEBUG("Calculated ACR timing N=%d CTS=%d for frequency %d\n",
|
|
*N, *CTS, freq);
|
|
}
|
|
|
|
struct amdgpu_afmt_acr amdgpu_afmt_acr(uint32_t clock)
|
|
{
|
|
struct amdgpu_afmt_acr res;
|
|
u8 i;
|
|
|
|
/* Precalculated values for common clocks */
|
|
for (i = 0; i < ARRAY_SIZE(amdgpu_afmt_predefined_acr); i++) {
|
|
if (amdgpu_afmt_predefined_acr[i].clock == clock)
|
|
return amdgpu_afmt_predefined_acr[i];
|
|
}
|
|
|
|
/* And odd clocks get manually calculated */
|
|
amdgpu_afmt_calc_cts(clock, &res.cts_32khz, &res.n_32khz, 32000);
|
|
amdgpu_afmt_calc_cts(clock, &res.cts_44_1khz, &res.n_44_1khz, 44100);
|
|
amdgpu_afmt_calc_cts(clock, &res.cts_48khz, &res.n_48khz, 48000);
|
|
res.clock = clock;
|
|
|
|
return res;
|
|
}
|